Stop/Start System Integration to Diesel Engine and System Modelling & Validation

Hybrid and micro-hybrid systems became widespread due to fuel economy benefit and environmental concerns. Micro-hybrid systems such as Regenerative Braking and Stop/Start system are commonly used in automotive industry. This paper is based on integration of a Stop/Start (S/S) system to 1.5 liter diesel engine. General information is given about subsystems which are used by S/S system. For fuel consumption model, engine mapping data is obtained by using an engine dynamometer. The equations of motion are used for the torque model. By using calculated engine speed and engine inner torque, total fuel consumption is calculated. For NEDC, cycle fuel consumption benefit of S/S system is simulated as 0.165 liter per 100 km which is measured as 0.16 liter per 100 km. An approximate model is developed which is useful to use at early phases of a project. For NEDC cycle, CO2 emissions benefit of S/S system is approximately 4 gr/100 km which is simulated as 4.5 gr/100km.